Display screen or portion thereof with a graphical user interface



The disclosures of U.S. patent application Ser. Nos. 29/666,325 and 29/666,340, titled display screen or portion thereof with graphical user interface and filed on Oct. 11, 2018, are hereby incorporated by reference in their entireties.

FIG. 1 is a front view of a display screen or portion thereof with a graphical user interface showing our new design.

FIG. 2 is a front view of a display screen or portion thereof with a graphical user interface in accordance with a second embodiment; and,

FIG. 3 is a front view of a display screen or portion thereof with a graphical user interface in accordance with a third embodiment.

The broken lines, including those showing a display screen or portion thereof and those depicting portions of a graphical user interface, form no part of the claimed design. 

CLAIM The ornamental design for a display screen or portion thereof with a graphical user interface, as shown and described. 